"Effective 20 March 2023, we will no longer support two-factor authentication using text messages for non-Twitter Blue subscribers. At that time, if you have text message 2FA still enabled, you will be prompted to disable it before you can continue to use your account. Please note the availability of text message 2FA for Twitter Blue may vary by country and carrier"

As was announced, this is only for SMS-based 2FA, so the title is a little misleading.